var rob = function(nums) {
  const len = nums.length;
  if (len === 0) return 0;
  if (len === 1) return nums[0];
  if (len === 2) return Math.max(...nums);

  const dp = new Array(len).fill(0);
  dp[0] = nums[0];
  dp[1] = Math.max(nums[0], nums[1]);
  for (let i = 2; i < len; i++) {
    dp[i] = Math.max(dp[i -1], dp[i - 2] + nums[i]);
  }

  return dp[len - 1];

}

const nums = [2,7,9,3,1];
console.log(rob(nums)) // 12